CONODONTS BIOSTRATIGRAPHY OF MILA FORMATION, SHAHMIRZAD SECTION, CENTRAL ALBORZ, IRAN

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SOLEYMANI S.; HAMDI B.; KARIMI BAVANDPUR A.

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Journal: GEOSCIENCES Year:2016 | Volume:25 | Issue:98 Page(s): 137-146

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Title

CONODONTS BIOSTRATIGRAPHY OF MILA FORMATION, SHAHMIRZAD SECTION, CENTRAL ALBORZ, IRAN

Author(s)

SOLEYMANI S. | HAMDI B. | KARIMI BAVANDPUR A. | Issue Writer Certificate

Keywords

MILA FORMATIONQ2

MID- LATE CAMBRIANQ2

ORDOVICIANQ2

CONODONTQ2

SHAHMIRZAD SECTIONQ2

CENTRAL ALBORZQ2

IRANQ2

Abstract

The studied section is located in the south of CENTRAL ALBORZ, 5 kilometers to the north of Shahmirzad City in the Semnan province. This section is situated at 35° 48′ 40″ N latitude and 53° 16′ 59″ E longitude. The MILA FORMATION has 5 measurable members in type section (Mila Kuh, Damghan City) and only in this studied section. This formation overlies conformably the Early Cambrian Lalun Formation and underlies disconformably the Early Devonian red conglomerates. Studied CONODONTs of this formation are of Proconodonts type belonging to Coniform Groups. Fourteen species and six genera of these CONODONTs were acquired indicating an age of Mid-Late Cambrian and Early ORDOVICIAN. These CONODONTs are listed as below: Proconodontus serratus, Proconodontus muelleri, Proconodontus rotundatus, Prooneotodus sp?, Prooneotudus tenuis, Furnishina furnishi, Furnishina asymmetrica, Furnishina sp.,Furnishina obliqus-Hirsutodontus?, Westergardodina cf. mossbergensis, Westergardodina fossa, Cordylodus, Cordylodus intermedius, Cordylodus lindstromi, Cordylodus proavus, Oneotodus nakamurai & Problematoconites sp. A Remarkable point is the discovery of species Prooneotodus tenuis in the second member of MILA FORMATION because no CONODONT has previously been reported from this member. Other microfossils such as trilobites, brachiopoda, hyolithes, eocrinoidae, rusophycus, cruziana, paleoscoleidae and sponges were also obtained indicating deposition of MILA FORMATION in a shallow marine environment. These fossil assemblages are comparable with those from other parts of IRAN and neighbor countries.

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APA: Copy

SOLEYMANI, S., HAMDI, B., & KARIMI BAVANDPUR, A.. (2016). CONODONTS BIOSTRATIGRAPHY OF MILA FORMATION, SHAHMIRZAD SECTION, CENTRAL ALBORZ, IRAN. GEOSCIENCES, 25(98), 137-146. SID. https://sid.ir/paper/32237/en

Vancouver: Copy

SOLEYMANI S., HAMDI B., KARIMI BAVANDPUR A.. CONODONTS BIOSTRATIGRAPHY OF MILA FORMATION, SHAHMIRZAD SECTION, CENTRAL ALBORZ, IRAN. GEOSCIENCES[Internet]. 2016;25(98):137-146. Available from: https://sid.ir/paper/32237/en

IEEE: Copy

S. SOLEYMANI, B. HAMDI, and A. KARIMI BAVANDPUR, “CONODONTS BIOSTRATIGRAPHY OF MILA FORMATION, SHAHMIRZAD SECTION, CENTRAL ALBORZ, IRAN,” GEOSCIENCES, vol. 25, no. 98, pp. 137–146, 2016, [Online]. Available: https://sid.ir/paper/32237/en

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